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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96fc9bbd31e49c4256d5032e26412fcda379a71c015956ee95f2ccc34d175d2d' 
  AND token = 'Z/eEIlMiPlr3YBsGrfB3GP8bbuy+c/jzbDqdHFLd4i0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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