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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebf5503664284ed1480e208b5d3528a3e6484724074a8f52900135493de9d55a' 
  AND token = '5Wcz0dI5msZhRWblMpdAwUYrSGZumCG9JZh6bgFly/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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