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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09dddb3201286b604b192145352da057b2baa159032a2af8fe013cb1655ac1b1' 
  AND token = 'Axkhc0ia27R04MR14Ug6In15q/hBnLNG0NnHIy7C4Yw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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