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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fdd741cf61c3efb8a9680386464f0755bc978c95ce871bd3b9245af0152a5cd' 
  AND token = 'yFg1CtKSi7TVPJyCOg5AabgDEcg2aFLQ7YhemL113C8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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