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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '538cd4cd0581dc26591a7b57e22dd7d1177a77a9d63a5ddc67a978c2345a948a' 
  AND token = 'BowDSUoa9q2aXLgAXaeyRCUiuKOv4brA6t8pOpk23/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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