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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fcde8dedf315c99de71fa6e14d4ab286eb68ae43131f434c0ea10665ce3faeb' 
  AND token = 'zEkbCUGm3CFOM6Q155MnwqXtU+IcHn/RMwdncshCOKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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