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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fd221753f20511ab55791abb74a4a957279b987b5d97a3159f175cfa6c1c9e8' 
  AND token = 'WmVM1btGe2ZjoH8p0KJx+EGpJRsbSlY2x4BcLitkssg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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