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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e902a57ed13d5d03738e4ba3a3bdc0083c79b1b93fbcc32eb29a6c4f125e55a' 
  AND token = 'Giuv1kf5u5fVJwbV3hGHc94eD5AFUMgAKo2rm0fgtFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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