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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '831a28af1b9559a936fbf18ca632dcfd37beed076d8bf016123e101c2289f075' 
  AND token = 'HsUpY8NzEEKHVeBKHTRxOZMm8vs1tNK41p9AECnST/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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