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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70ece39c5e1af73264b747a8264fb1099d4d1abf462f48e93201e8d68d14f303' 
  AND token = 'xshFMvOMbMSe5QRT/xT6Jouhia+qx15O/CF80oDb1rs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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