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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c39d68758d1570d0c842ca8e8a64f487487f61b74eded0936c4abdcf05d22b47' 
  AND token = 'l0EIOZ83e8CsNo5zfeYiNulPJYL9gH3cmH/8n9CEunQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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