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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb3f996fbba94f6c6ed56ac3e79ecc0c686c7ca7dee8133f0d830df0843c387b' 
  AND token = 'bAso6NgQp9SJqaxDjBNguIGea1/5V7xAkqmxeMs8FbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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