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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20f2845e1728ee749dd2bb46118eed1d840f009d58f0419c4aba7d0f36cf4474' 
  AND token = 'Zs5dtiAXvANEEACW2xu4i+57oAaluXX8pJCdzQkjEaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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