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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e2b00dc4358668eb196c43158416a432d3be47846602564a9bd5026f565db74' 
  AND token = 'aWGmYNrZRjjLQ2t333aY7bVn83Kcsx+Sje98jHh/TkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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