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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f1e94acacba22a02fbe21e0b1264bdb4efed3a2e219ae96dccafeca134abc81' 
  AND token = 'oF0qozoJhZ4zWkIOi53vzJlvNQSNPCOpYSNJQSNoD80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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