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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a30acd947bda1d68d8fa11307fb104cd78a866162c5719fbe75e6216a6b59b40' 
  AND token = 'MFXyLrDBs2TvUKO+Y2MQHhav/5l8/El9xWdw1xWSmkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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