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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be1fbdf6b3c48acd75753cc2e4cd7d0e737c370d6a08062266aacaeb7edc9102' 
  AND token = 'h698XLC1/tvIrm2Sn75HtGeSOISVfuJv0BUEqpS9FoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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