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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d0bdcedbbc308c7c5039f828cd1c03d01a60b3ec097b38756a73f4e4aea70ec' 
  AND token = 'wZZjQvHdFOjzhof0EQypCU3fIoUsBRVCVSkJE//9r8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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