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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78c926849920470cc421304f1bfd27668992f38243fbff33779848ed45ab8889' 
  AND token = 'hDd1WLeGjSIn1WDtg7oyW1/nF8VptnJJ+3FbLEroW80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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