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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '012480dd14bb06165fb85a6b6a4ab024b249b045f4e273084b3c5d1bccd61449' 
  AND token = 'y6Ve1CVV7PMPh0M32NZIsO9xyhOp5EwMTJpXFNpKj08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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