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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '734d4f2c98e0688987d6ee754529fe7584adb66b86b7c685c56fb59dda1c025d' 
  AND token = '2hDLaHVLYlw6ODtQw+5WPGpp8tIUwTe87biG9j1bh6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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