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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '737111f8d372825f824ff18ca7fddb1107079583e9c339babcbc463402ca0a14' 
  AND token = '8s2f/4lWr0XsrUYKqIsutaJw4EoAXptD+x/DP0VCQCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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