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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fc9278d7be0b604ec02d231a107884f61ff6c734023b3cef1c107336f144aae' 
  AND token = '4XTx+KB2bSEz1iVDuajOPClrcHtZe4E7FDH7CN5T058=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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