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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38c1551400f344c22bc2840ec3d10874c43236dc77fe41fc58dcd8efa024f556' 
  AND token = 'ykDl6COBlCVF0guADuYF7uZmUo9NHWV7Cd4o739ppxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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