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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '241a043aa0d747de7ab69df3a95a89e1ff268d60a81eaca6d403c8631cec65b4' 
  AND token = 'RKpr54luWDQZcaFXXHPG2XwbquDoaDi95R+RDmZrrjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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