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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3be175be870a54388f3c2720c0ab0b39dfb564e4d44205e7ec7ddfe27a06c418' 
  AND token = 'ynFTPd7uVoTcc0rfQypiQENpyXtlk8rwbvz3je9I8bo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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