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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9ed46c73612ebefcb6f47d9eb36fda6bcb375cb736a22cb308ef6af19c69f47' 
  AND token = 'MiMlK4cMNU9QLdFFhrGvrMftv5nwryomNrR7pwjSQfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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