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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '464b81ad3ebf72738e3958101f2cd3ef1c8ca6d8df26a2273a40d2af9d0b3e7c' 
  AND token = 'fXR3HUY/LV3pkANz1/Qop/e68BOAf52ev8tB4Dbhzh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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