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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96ce393b1eb08862a21930aefb62bd2ff70a9fbe19709f6d229eb77b1b40f035' 
  AND token = 'usI7ojUO9AePNnKZA0OU8272nS3CR9QlQZKaDHtNXvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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