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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '019a63c170d73166bea235dd28e7d3fce8ab5cdc0a8783ae8f17f56bac96da5d' 
  AND token = 'WduIyDIUqGNrjD3vghSUZx5dudH6z81Y52/e18qEGR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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