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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '069e9db602a7d49bb36c04b6503b36341c42ce165375779a04d368c42bc29d69' 
  AND token = 'O3CZchhXRi4Y9h+nyB6qzIj2pjWE+0uKuSibsKW9L4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00125

JSON explain

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