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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3484e426facdfe499edbfccd377c15225052e0f43e5a6a8dc930ed84f81e5bab' 
  AND token = 'nbd4DmkuaJm/A+uU1gXOIIemQJE5zeZl6c+KVmwwgDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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