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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4faa0698a2df24a2bef052817a9ae676996ea63a41fe9af57256dbb1806f2829' 
  AND token = 'Cg7nyZSazhQfDdRzs02vJjmmeU0acY2iwt8vipexwns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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