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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f03ced0779863057cbac7fa76ac9dcc225a3e08133e2e9598e31d1904e9e932b' 
  AND token = 'ncGumF7vOAiOdHLrFHHKFx+IZD45ZMaqjwZA07J8wfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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