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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eacfb1eea7dc79de8f4665f7f9eba93fb520dfbf2e0410d16371a499da0c06f7' 
  AND token = 'rigzlkzmb6PoiaWTQdXsu8FTBrYuRn/52sKKv3Hvd4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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