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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ae76446149e97153c6375cbab100d14358dfe96a0b493d2b946a986b4979e16' 
  AND token = '1HB3E4ZfSFymt+8sZJeMkuo6QKepjAzo79wsiyKfHAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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