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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ca36a5d352c6a2ab13cc34461688fd9e703e7b60d1e498815cbdcf8c8ae9be5' 
  AND token = 'GFNgp4ST6KBMJvy55+3Fqnerc8rWt360SDGBxbC+nvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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