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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4323dc542069c1960af25f34df808c82e9ecafadad441b49e894533bc836d3c7' 
  AND token = '3746Ws//vY3q4ASITqZqrogO6ZW74HL/DxizU1ovikI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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