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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aeb61d2a8d7b822828b40aae2fe36e0c046fb65893a58ffc107d91b2252eba22' 
  AND token = 'jgJYXYoodAAPvzb1tTPFYFSsVj0mSrNacUFBHASsRNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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