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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d13e6cec80cb40e2cbe6f79fb5849b7f192016ed188237a04ae751fcbcd2b87' 
  AND token = 'ak4sDsNswmECbJP+wEbzUVMogI19dc/QDNMlrJUnX/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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