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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7602e8367c58c8d01df5fb2d17cee97be15adda2136f86ea8a2a0c6c724b5e3a' 
  AND token = 'NJ//4tGHZbpgvYuMWE3J7F8p6V6HG7ekXO3QRMis5TY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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