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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f340ceb6d02c26de5f6dd00059e6b884320839d31d539fbb2b31b878274f14fb' 
  AND token = 'q0oaJWyneDEgS3Sw5lP7Uksz04fLRCWupXaLx7kT128=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}