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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b33704c474695d989afc3c2b14235b7cd184f0005fed795d279f7a62a529072' 
  AND token = 'Vf5DXONg0+VAMG7NYciCQoc/Jrq8eqf7p19ZidrvLXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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