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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdaa0321b9dfd824717e1b2a007cf3e73b5cb35ed199d6f76edfec59b1b9126e' 
  AND token = 'Dt4D0786BSgoQztSh4krOM8S8gRCs9B4uMLhGZyOJlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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