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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '275200fb442a731c47e2e9943def99ccb26c9ce427f439482ff596c01ec257e8' 
  AND token = 'kOOKPZitjfWXJQTuLvDpsaNkow71K6Tn2b3dPDkcSVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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