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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c92098afa4e2919fd41583ada9c06ca405367786f8b89f5ae4d85fe861f5a44' 
  AND token = 'cfIFJG6IxyUwOaj+SGxJqisvt/swKjeIwruMSCHT5iE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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