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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ad715b2a04cf0cbf8002720ef6d27500add9e724c4ef9cf09da24448dad1bd4' 
  AND token = 'L4izvAprVWoOA7iBwS3WxP5YUp17n9GD//wJhrFA2H0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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