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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e04dd84fdbea8474968fd7c83a088435e950a0dea28d0702685d7fc2bc7f1d8' 
  AND token = 'FzLvl95LTNCO7kuDzfQ/EWUsBqlrSmXoxAdXcCmGiEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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