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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f2fd52d3c1daaf94d2bc4acf48a51e80f6d8eb163fbd0e1a11aee53f51010d9' 
  AND token = 'cZZP5V3Y1h1aaAR6c8Xs/d7GO6cb3t4k/l0eCqgRATs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}