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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c04cb35754474a9e9a7b0fc2ff1b6ed02281ce553fb473fd52dd9a073169b110' 
  AND token = 'FsNYbAmTI5/pxPHkS47KcJfLPK3YaFoDb/qn4PO8zCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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