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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51195b334982b76f00f29892d5a569ecec306154594d465cc5696c4e4401cb4a' 
  AND token = 'NrqS54Ff4rz6qr7SJrTNdWJ+aqHX/zoLoZbCq2+f9P0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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