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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53093731ec7b01f63aad104de91df100968dee00efc346512b0dbe695a890b18' 
  AND token = 'Ft2Vbcbi22HtYFNtHs1NuN9bCMLgH0TfcBjFujfsJgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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