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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '972e780b9a0ae1527823e35d06a7626ce9f3d1337347b3c23d31a2c2d93e7dba' 
  AND token = '0n7KZ//wOcYOLum8/XKV0xr0ouJg5/Ql/eRmHYQhijA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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