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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76ee680023c7bd205592b617bfe496fdfb2d1ec78065fda7bd81074db1b6fdc1' 
  AND token = '/xjoMQN3blDN+vKEJbLkFED0ZhUCK2YMT56WO4PxYUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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