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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84184cf3dd1d690eeeb4d97437c299e9c993f12aba3def4add3a77e01fa626eb' 
  AND token = 'PQ0eHysjCS9u1H6RENQJR3HDX34mh2XLNtfdiDEttJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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