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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '255acac98c04e09850d2b7da98efad8633f4e6844fdfcb62aa25dd4a4be5a872' 
  AND token = 'jleDNXIcCBfOI6ZtxpTAiE5mFVLjP7+G6r90JIjNEow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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