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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '695085c94ca659a7795b23f3c0bb9d8b5f9958fa4fa2c2b276bce0838474b687' 
  AND token = 'H/TDcQ4g2N2h4lRciM9QQHhMFQdPzBokW/Ztd+s75ZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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