SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '456700873c7b2ce632e0dc574d18f59538ef6b3c53ef33ccd91074fa60ad54bf' 
  AND token = 'C1nQ+kihq1zZuEWpHP+OliGq4S05rSHwRjSHBG2xlwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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