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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a04f192cb89eb9f6c462991df4272cd365cc0b2c6daf50cf063dc31094e2d957' 
  AND token = 'vkW5PIMpXvlcs0Z/9hvog1difYGQ0TfphNmwGHIk/dc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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