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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ae7719318b6786683cd9560aa0999b60a876de034c6cb9aa66e2955432c6990' 
  AND token = '7S5ljW5tDre3kov4N0hFWVFYNDOOG8kH9nLHM1yFGe0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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