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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93117d79e4c54c7aaa3b243e84303c10cb2b2d9296bce4b0e2d0bce04fcc9b49' 
  AND token = 'e53M9UhlGy3Ak6q6pla5Aj3qMqgQQ1piIlgAe5kFAvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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