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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35774a5a8ba7a45c281edd81ab266e72d4a801c2aa83c2150476327ae0114c34' 
  AND token = 'RPW3OwoAPGzVL5L/4YeqcHfs0NU0jVm0Gp5SnoVKtug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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