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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9d0fa3ee77a465ccd2536fb180ed04d1f430f2f52ad855eb355f61cb15305b8' 
  AND token = 'lajreMWZL3JhrtGWybD4GNUMEJQQuudieWGWnPmIlio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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